Bird Technologies 3129 Display - Manual (Page 55)

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Figure 26 Config Screen, Alarm Tab
You can select or deselect the following alarm conditions:
Master Alarm Enable - When checked, activates the VSWR alarm and
enables all other alarm conditions that have been selected (boxes checked), dis-
ables all alarms when not checked.
VSWR trip point - Specify the VSWR value that will cause an alarm (select val-
ues from the drop-down list). This value is adjustable from 1.3 to 2.5 by incre-
ments of 0.1. Check the VSWR Alarm Enabled on Zero Power checkbox to allow
the VSWR alarm to trigger at very low forward power (< 2.5% of full scale
power).
High Power Alarm (forward power only) - Check the Enable box and spec-
ify the percentage of full scale at which an alarm will trigger. The high power
value must be greater than the low power value. The maximum value is 125% of
full scale power. The alarm setpoint is entered as a percent of full scale. For
example, if you have a 500W full scale unit and would like an alarm when the
forward power exceeds 375 W, the alarm setpoint would be 375/500 x 100 or
75%. Enter 75 in the field and check the Enable High Power Alarm checkbox.
Low Power Alarm (forward power only) - Check the Enable box and specify
the percentage of full scale at which an alarm will trigger. The low power value must be
less than the high power value. The minimum is 0%.
Latch Alarms - Sets whether the alarm will reset automatically in the absence
of an alarm condition. When this checkbox is unchecked, if an alarm trigger is
corrected, the alarm will reset after a forty-five second delay. When the box is
checked, the alarm must be manually reset.
After you have set or made changes to alarm settings, you can test the settings
by clicking on the Trigger Alarm button.